Federal prosecutors recently subpoenaed records from the aviation giant regarding the South Carolina production of the 787 Dreamliner model amid allegations of inferior craftsmanship, according to two anonymous sources familiar with the probe, as reported by theSeattle Times.

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Sources claim the subpoena was issued by the Department of Justice, which is also conducting a criminal probe into the certification and design of the 737 MAX after two jetliner crashes.

Boeing divides its Dreamliner production between the South Carolina assembly plant, which began manufacturing planes in 2012, and a facility in Everett, Wash.

Construction on the 737 MAX occurs in Renton, Wash.

Prosecutors have been scrutinizing the development of the 737 MAX, including the flight-safety control system Maneuvering Characteristics Augmentation System — MCAS for short — after two devastating crashes. The first was Lion Air Flight 610 that slammed into the Java Sea Oct. 29, 2018, after departing from a Jakarta, Indonesia, airport. All tolled, 189 passengers and crew members lost their lives. The second crash, Ethiopian Airlines Flight 302 went down March 10 near Bishoftu, Ethiopia. All 157 people on board perished, which led to the global groundings of the plane.